One of my kitchen scrap projects worked! I read you can regrow celery. Cut the base of the celery off and put it in bowl of water for 7-10 days, changing the water every few days. The celery will begin to resprout! Then, transfer it into an 8" pot, covering the base with soil, allowing only the new sprout to e above soil. Celery can be grown indoors with enough light, but check your zone (South Jersey is 6B, Besançon is 8A) to see when it can be left outside. Generally celery is from May to August.
It started shooting up new leaves within a few days. Once this happens, keep a good eye on the water level cause I found the poor guy bone dry a couple times. It just sucked up all that water once it started shooting.